31012321313 has 4 divisors (see below), whose sum is σ = 31209852180. Its totient is φ = 30814790448.

The previous prime is 31012321309. The next prime is 31012321337. The reversal of 31012321313 is 31312321013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21015721024 + 9996600289 = 144968^2 + 99983^2 .

It is a cyclic number.

It is not a de Polignac number, because 31012321313 - 2² = 31012321309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31012321013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98765198 + ... + 98765511.

It is an arithmetic number, because the mean of its divisors is an integer number (7802463045).

Almost surely, 2^31012321313 is an apocalyptic number.

It is an amenable number.

31012321313 is a deficient number, since it is larger than the sum of its proper divisors (197530867).

31012321313 is a wasteful number, since it uses less digits than its factorization.

31012321313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197530866.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31012321313 its reverse (31312321013), we get a palindrome (62324642326).

The spelling of 31012321313 in words is "thirty-one billion, twelve million, three hundred twenty-one thousand, three hundred thirteen".